Thalictrum 2011

Thalictrum kiusianum (Kyushu Meadow Rue) is a wonderful mat former, too. Although it spreads rather slowly.

Very nice Rick, you have a much larger stand than I do, looks great! I haven't had it for years, but was given a plant last year, and even with this modest replenishment I've been enjoying the long season of bloom. The fall color is good too! I would advocate this as one of the top 100 essential rock garden plants, particularly for a half-shaded rock garden.

Beauties! So well grown, all! Despite our wet summer, I think all of mine would like more water still.Here's Thalictrum 'Elin', apparently a hybrid of Thalictrum flavum var. glaucum and Thalictrum rochebrunianum:

Beauties! So well grown, all! Despite our wet summer, I think all of mine would like more water still.Here's Thalictrum 'Elin', apparently a hybrid of Thalictrum flavum var. glaucum and Thalictrum rochebrunianum:[attachthumb=1]

Very nice... I have not heard of 'Elin', but given its parentage, I would agree that it looks quite intermediate between the two. I think most of these tall thalictrums would be happiest alongside a partly-sunny stream in a meadow setting, they do crave water.

Does anyone have a remedy short of nuking them for the little catarpillars that completley defoliate my T. rochebrunianum? They also do a number on all my Aquilegia. I've started using systemic granules to see if that will do the trick.

I have plenty of problems with insect defoliation of aquilegia, but never had anything eat any of my thalictrum species or hybrids to the point of devastation, like they do with aquilegia. In fact, they are one of the most pest free plants in the garden!

I just went out and took a poll in the garden. These have absolutely no leaf insect damage in the shade garden:T. kiusianumT. thalictroidesT. flavumT. dasycarpumT. rochebrunianum Lavender MistT. filamentosumT. ichangense

I also have T. aquilegifolium that is in full sun (don't ask me why 'cause I don't know). About a tenth of it's leaves have part(s) eaten.

I'm sure we would all be interested in learning the results of your use of the systemic granules. Any preliminary conclusions?

In previous gardening areas, if the leaves were being eaten by caterpillars that work outside the leaf, or even by leafminers, I found that manual squashing worked well... pretty satisfying too, if they are really bothersome. ;)

I never experience defoliation of Thalictrums or Aquilegias. They are among the healthier plants here.So is Astranta major. But I am at the lookout of something that can defoliate this one as it has become a pest plant in my garden >:(

The defoliation happened earlier in the season and the plants have releafed out with flowers...the Aquilegia were worse, but are recovering now. I only treated the plants in pots and cut back all existing foliage. So I'll keep you up to speed if there is something good to report.I'm using Marathon which is not available to the general public and can only be ordered through a wholesale nursery supplier, but I've been told that Bayer brand rose & flower systemic works really well on lily leaf beetles and other nasty critters, so it may work for these insects as well.